pinctrl: renesas: r8a779g0: Add missing MODSELx for AVBx

AVB1 needs MODSEL6, AVB2 needs MODSEL5 settings.
This patch adds missing MODSELx settings for the affected pins.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87k08xsj81.wl-kuninori.morimoto.gx@renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>